2008 ML350 at a local MB dealer. They will certify it and list at ~$26k

We are also considering a Toyota 4runner.

The ML was traded in by the original owner (looks like it was a loaner car for its 1st 25k miles) for another ML.

But, my wife and I have heard plenty of horror stories about electrical and other reliability problems with MLs. In fact, the ML we originally went to see at the MB dealer was unavailable for a test drive b/c it wouldn't start due to an unidentified starter/battery/alternator issue. That was a certified PO vehicle as well.

I noticed that there was a bit of vibration in the steering wheel on the test drive, but other than that it felt really good on the road. However, after I got back to the dealership, I got a copy of the Carfax and found that the vehicle has had the turn signal replaced and the PS pump and rack and pinion replaced, at about 35k miles (it's at 80k now).

We can get it certified, but I am not sure whether this is a good idea - MB will fix it for a year, but after that, any issues are ours.

So what does the forum think about MLs in general, CPO from MB and how much risk you would take on a vehicle that has had driveline components replaced, and whether a 4runner might be a more reliable choice for the family?

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT